An autopsy has revealed horrific details of a new mum's killing in a Hollywood apartment, described by police as "the most brutal murder in LA's history".

Model Iana Kasian, 30 and from the Ukraine, was allegedly tortured and subsequently murdered at the hands of her boyfriend and father of her child, Blake Leibel.

What was unknown until now was the gruesome manner in which she died - which local investigators say they have never seen before and the details of which read like something from a horror movie.

Gruesome details have been revealed of how model Iana Kasian, 30, met her death (Image: Facebook)

Leibel is described by the New York Post as a 'trust funder' 36-year-old living off $18,000 (£13,000) per month from his father, a wealthy Toronto developer, and who wanted to make it big in Hollywood.

A profile has since emerged of a wannabe graphic novelist who weeks before Iana's death penned a gruesome tale about a murder.

It had at least one horrifying similarity with her killing - the victim's body was drained with blood.

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Media reports say that in May last year - two months after baby Diana was born - Iana went to visit the 35-year-old at their Hollywood apartment in the 'hope of reconciling' after having left to live with her mother.

Then on May 26 her mother called police begging them to check on her daughter's welfare at the couple’s apartment.

Police arrived to find Leibel barricaded in their bathroom - with Iana’s dead body and baby daughter lying next to her unharmed.

Until now little has been known about what's happened - and the graphic details of the crime revealed in an autopsy are shocking America.

Blake Leibel was found in a boarded up bathroom next to the model's body (Image: Patrick McMullan)

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Dr James Ribe of the Los Angeles County Coroner’s office explained the horrific abuse Iana endured before her death.

“[Iana’s] entire scalp was traumatically absent and was not found, was not present with the body.

"Her skull had been stripped down to the surface of the bone ... there was no scalp present except for little bits in the back of the neck."

Her scalp has never been found - and according to the report Iana, who was also covered in bruises and had been bitten, had been alive for at least eight hours after she was cut on her scalp and bruised on her body.

Blake Leibel pictured at a Hollywood party with a friend (Image: Patrick McMullan)

Dr Ribe added: “Also portions of the right side of her face were torn away including the right ear and part of the posterior face on the right side, all the way down the jawline."

The coroner concluded Iana's cause of death was exsanguination - the complete draining of blood from a person's body.

The secondary cause of death was given as repeated blunt force trauma to the head.

Dr Ribe, who has worked in medicine for more than 20 years, said: “I have never seen this before. And I doubt hardly any forensic pathologists in this country or abroad have even seen this, outside of, perhaps, wartime ... it’s extremely rare."

Currently being held in LA County Jail, the sickening nature of Leibel’s alleged crimes means he could be facing the death penalty.

Leibel - currently being held in an LA County Jail - is pleading not guilty to murder , according to news.com.au .

Blake Leibel, pictured at a Hollywood party, was well known on the local scene (Image: Patrick McMullan)

His Hollywood friends have since addressed what are described as a number of "peculiar" things he did.

He is said to have originally left his heavily pregnant wife and small child to move in with Iana, who studied law before moving to the US.

The Washington Post reported that, not long before the murder, Leibel co-wrote a graphic novel called Syndrome about a mad doctor who tries to cure evil in a remorseless serial killer.

The plot is said to begin with a corpse being drained of its blood.

One Hollywood producer who knows Leibel told the Toronto Sun : "He wanted to be a respected comic book guy and he used his money to create that image.

"He wanted to be cool and edgy — and he wasn’t. But you could just tell, he wasn’t right in the head."

On May 20 Leibel was arrested and charged with sexual assault of a third, unnamed woman - and released on US $100,000 (£74,000) bail.

Iana was murdered six days later.

A judge has ordered Leibel to undergo a mental health examination at the request of his attorney.